Study in ABS Surface Finish

Attached are some photos showing the results of a simple experiment with printed ABS surface finishes, specifically "washing" with acetone (nail polish remover).

The first picture, "ABS Unwashed.jpg", is the print (Yoda Lite) with no treatment done to it. As expected, the finish shows the layers clearly and has a slightly rough finish to it.

The second, "ABS Acetone.jpg", shows the finish after a quick (~10 second) bath in acetone. The part was immersed in a metal dish with the acetone and removed, allowed to air dry. The finish is much smoother and hides the layers partially. Interestingly, it has a distinctive "wet" look to it. (For some time, I thought the acetone wasn't drying, but in fact, it just looks wet.) It also feels really nice and clean.

In the third picture, "ABS Acetone water.jpg", I rinsed the acetone off with water immediately after the bath. This left a distinctive white discoloration and "taring" of the finish. It looks like paper towel shreds were l